Legal claims defining the scope of protection, as filed with the USPTO.
1. A method of operating a Base Station (BS) supporting a Fractional Frequency Reuse (FFR) scheme in a wireless communication system, the method comprising: broadcasting a reference value for determining an FFR region; receiving region information determined by using the reference value from at least one Mobile Station (MS); determining a communication band of at least one MS by using the region information received from the at least one MS; and allocating resources in the determined communication band to the at least one MS, wherein the reference value corresponds to a ratio of an area of a center region of a cell of the BS to an area of an edge region of the cell of the BS.
2. The method of claim 1 , wherein the region information consists of one bit.
3. The method of claim 1 , wherein the determining of the communication band of the at least one MS comprises: determining a location of the at least one MS to one of the center region and the edge region according to the region information; allocating a resource within a band set to a reuse rate of ‘1’ to an MS located in the center region; and allocating a resource within a band set to a reuse rate of ‘N’ to an MS located in the edge region.
4. The method of claim 1 , wherein the reference value is broadcast through one of a broadcast channel and a traffic channel in a form of a message including a broadcasting Connection IDentifier (CID).
5. The method of claim 1 , further comprising: adjusting the reference value according to at least one of a load condition of a cell of the BS, an interference level of the cell of the BS, an MS distribution of the cell of the BS, a load condition of at least one neighbor cell, and an interference level of the at least one neighbor cell.
6. The method of claim 5 , wherein the adjusting of the reference value comprises: decreasing the reference value if the loading of the cell of the BS is less than a first threshold; and increasing the reference value if the loading of the cell of the BS is greater than a second threshold.
7. The method of claim 5 , wherein the adjusting of the reference value comprises: decreasing the reference value if the ratio of the number of MSs in the center region to the number of MSs in the edge region is less than a third threshold; and increasing the reference value if the ratio of the number of MSs in the center region to the number of MSs in the edge region is greater than a fourth threshold.
8. The method of claim 5 , wherein the adjusting of the reference value comprises: increasing the reference value if the interference level of the neighbor cell is greater than a fifth threshold; and decreasing the reference value if the interference level of the neighbor cell is less than a sixth threshold.
9. The method of claim 5 , wherein the adjusting of the reference value comprises: increasing the reference value if the loading of the neighbor cell is greater than a seventh threshold; and decreasing the reference value if the loading of the neighbor cell is less than an eighth threshold.
10. A method of operating a Mobile Station (MS) supporting a Fractional Frequency Reuse (FFR) scheme in a wireless communication system, the method comprising: receiving a reference value for determining an FFR region from a Base Station (BS); measuring one of path loss values and received signal strength values for a serving cell and at least one neighbor cell; determining a region to which the MS belongs by using one of the path loss values and the received signal strength values, and the reference value; transmitting information reporting the region to the BS; and receiving an allocation indicating resources in a communication band corresponding to the region, wherein the reference value corresponds to a ratio of an area of a center region of a cell of the BS to an area of an edge region of the cell of the BS.
11. The method of claim 10 , wherein the determining of the region to which the MS belongs comprises: determining a region determinant metric by using one of the path loss values and the received signal strength values; and determining the region of the MS by comparing the region determinant metric with the reference value.
12. The method of claim 11 , wherein the region determinant metric comprises one of a difference between the path loss values for the serving cell and the at least one neighbor cell, a ratio of the path loss values, a ratio of the received signal strength values, and a ratio of the received signal strength values and noise power.
13. The method of claim 12 , wherein the determining of the region determinant metric comprises considering path loss values and received signal strength values of one of 2, 3, and 4 neighbor cells which produce the greatest interference among a plurality of neighbor cells.
14. The method of claim 12 , wherein the determining of the region of the MS comprises: determining the region of the MS to the edge region if the reference value is greater than the region determinant metric; and determining the region of the MS to the center region if the reference value is less than or equal to the region determinant metric.
15. The method of claim 10 , wherein the information reporting the region consists of one bit.
16. The method of claim 10 , wherein the receiving of the reference value comprises receiving the reference value through one of a broadcast channel and a traffic channel in a form of a message including a broadcasting Connection IDentifier (CID).
17. A Base Station (BS) apparatus supporting a Fractional Frequency Reuse (FFR) scheme in a wireless communication system, the apparatus comprising: a transmitter for broadcasting a reference value for determining an FFR region; a receiver for receiving region information determined by using the reference value from at least one Mobile Station (MS); and an allocator for determining a communication band of at least one MS by using the region information received from the at least one MS and for allocating resources in the determined communication band to the at least one MS, wherein the reference value corresponds to a ratio of an area of a center region of a cell of the BS to an area of an edge region of the cell of the BS.
18. The apparatus of claim 17 , wherein the region information consists of one bit.
19. The apparatus of claim 17 , wherein the allocator determines a location of the at least one MS to one of the center region and the edge region according to the region information, allocates a resource within a band set to a reuse rate of ‘1’ to an MS located in the center region, and allocates a resource within a band set to a reuse rate of ‘N’ to an MS located in the edge region.
20. The apparatus of claim 17 , wherein the reference value is broadcast through one of a broadcast channel and a traffic channel in a form of a message including a broadcasting Connection IDentifier (CID).
21. The apparatus of claim 17 , further comprising a manager for adjusting the reference value according to at least one of a load condition of a cell of the BS, an interference level of the cell of the BS, an MS distribution of the cell of the BS, a load condition of at least one neighbor cell, and an interference level of the at least one neighbor cell.
22. The apparatus of claim 21 , wherein the manager decreases the reference value if the loading of the cell of the BS is less than a first threshold, and increases the reference value if the loading of the cell of the BS is greater than a second threshold.
23. The apparatus of claim 21 , wherein the manager decreases the reference value if the ratio of the number of MSs in the center region to the number of MSs in the edge region is less than a third threshold, and increases the reference value if the ratio of the number of MSs in the center region to the number of MSs in the edge region is greater than a fourth threshold.
24. The apparatus of claim 21 , wherein the manager increases the reference value if the interference level of the neighbor cell is greater than a fifth threshold, and decreases the reference value if the interference level of the neighbor cell is less than a sixth threshold.
25. The apparatus of claim 21 , wherein the manager increases the reference value if the loading of the neighbor cell is greater than a seventh threshold, and decreases the reference value if the loading of the neighbor cell is less than an eighth threshold.
26. A Mobile Station (MS) apparatus supporting a Fractional Frequency Reuse (FFR) scheme in a wireless communication system, the apparatus comprising: a receiver for receiving a reference value for determining an FFR region from a Base Station (BS); a measurer for measuring one of path loss values and received signal strength values for a serving cell and at least one neighbor cell; a determinator for determining the region to which the MS belongs by using one of the path loss values and the received signal strength values, and the reference value; and a transmitter for transmitting information reporting the region to the BS, wherein the receiver receives an allocation indicating resources in communication band corresponding to the region, wherein the reference value corresponds to a ratio of an area of a center region of a cell of the BS to an area of an edge region of the cell of the BS.
27. The apparatus of claim 26 , wherein the determinator determines a region determinant metric by using one of the path loss values and the received signal strength values, and determines the region of the MS by comparing the region determinant metric with the reference value.
28. The apparatus of claim 27 , wherein the region determinant metric comprises one of a difference between the path loss values for the serving cell and the at least one neighbor cell, a ratio of the path loss values, a ratio of the received signal strength values, and a ratio of the received signal strength values and noise power.
29. The apparatus of claim 28 , wherein the region determinant metric is determined by considering path loss values and received signal strength values of one of 2, 3, and 4 neighbor cells which produce the greatest interference among a plurality of neighbor cells.
30. The apparatus of claim 28 , wherein the determinator determines the region of the MS to the edge region if the reference value is greater than the region determinant metric, and determines the region of the MS to the center region if the reference value is less than or equal to the region determinant metric.
31. The apparatus of claim 26 , wherein the information reporting the region consists of one bit.
32. The apparatus of claim 26 , wherein the reference value is received through one of a broadcast channel and a traffic channel in a form of a message including a broadcasting Connection IDentifier (CID).
Unknown
July 24, 2012
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